71812 CD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71812 CD/P4DGA
Basic Information
System of measurement
Metric
Weight
0.2 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
78 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4972 lbf
Radial static load rating
6412 lbf
Limiting speed
33 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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71812 CD/P4DGA Bearing Product Overview & Core Advantages
The 71812 CD/P4DGA is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a P4 tolerance class bearing, it guarantees exceptional dimensional and running accuracy. Its universal matchable (SU) design allows for flexible mounting in pairs to support combined loads (radial and axial) in both directions. The phenolic cage and optimized internal geometry contribute to its outstanding high-speed performance, making it an ideal choice for high-precision spindles and machinery requiring ultimate reliability and accuracy.
71812 CD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71812 CD/P4DGA is decoded as follows:
- 71812: Basic series designation for a super-precision, light-weight angular contact ball bearing.
- C: Represents a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is supplied as a universal matchable (SU) set. Two bearings can be mounted in any configuration (back-to-back, face-to-face, or tandem) to achieve the required stiffness and load capacity.
- P4: Denotes the tolerance class, equivalent to ISO Class 4. This signifies extremely tight dimensional and running accuracy limits for superior performance.
- DGA: Specifies the preload level. In this case, Extra light (A) preload, which minimizes friction and heat generation, making it ideal for very high-speed operation.
71812 CD/P4DGA Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design and the ability to be mounted in a universal matchable (SU) pair enable the bearing to support significant combined radial and axial loads from both directions, providing a rigid and stable rotational system.
- Superior High-Speed Performance: The lightweight phenolic resin cage ensures low centrifugal forces and excellent guidance, while the 15° contact angle and extra light preload (DGA) work in concert to minimize friction and heat, allowing for a high limiting speed of 33,000 rpm.
- Exceptional Precision: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring extreme rotational accuracy and surface finish quality.
- Optimized Internal Geometry: With a bore diameter of 60 mm and a compact cross-section of 20 mm, it features a high ball count (28 balls) and a large ball diameter (5.556 mm), contributing to its high dynamic and static load ratings.
71812 CD/P4DGA Bearing Typical Application Areas
This super-precision angular contact ball bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding the highest levels of accuracy and surface finish.
- High-Frequency Motors and Spindles
- Aerospace Gyroscopes and Instrumentation
- Medical Equipment: Such as high-speed dental handpieces and laboratory centrifuges.
